Anyone have (or know where to get) a 66 under dash wiring diagram? I have some wires that I am lost as to where they go.

 

So I've figured out that one is an inline fuse, but I don't know where is goes or what it's for. The other thing is for the brake lights, and everything else I'm still at a loss.

 

http://hammar.dyndns.org/~djhamma/wiring/wiring1966.htm
Try this link
I used this website for every wiring diagram on my 1967.

 

the taped up wires look like rear speaker wires someone has added and run under the carpet .. the fuse link wire is probably added also ...that brake lite switch is a bugger to put back on ..it must have a missing clip for it to have fallen off ...

 

I just reworked my dash with original style harness. The only thing original in your picture is the brake switch. Previous reply is likely correct, most of it looks like aftermarket stereo related.

 

You can buy printed diagrams from any of the vendors. I've used this one for 20 years:

http://www.cjponyparts.com/wiring-di...g-1966/p/BKW2/

They also sell an Assembly manual that is excellent, but your car looks like it is done!